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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Usage of is_trivially_constructible is broken with these compilers.
// See https://bugs.llvm.org/show_bug.cgi?id=31016
// XFAIL: clang-3.7, apple-clang-7 && c++17
// <iterator>
// class istream_iterator
// constexpr istream_iterator();
// C++17 says: If is_trivially_default_constructible_v<T> is true, then this
// constructor is a constexpr constructor.
#include <iterator>
#include <cassert>
#include <string>
#include "test_macros.h"
struct S { S(); }; // not constexpr
#if TEST_STD_VER > 14
template <typename T, bool isTrivial = std::is_trivially_default_constructible_v<T>>
struct test_trivial {
void operator ()() const {
constexpr std::istream_iterator<T> it;
(void)it;
}
};
template <typename T>
struct test_trivial<T, false> {
void operator ()() const {}
};
#endif
int main()
{
{
typedef std::istream_iterator<int> T;
T it;
assert(it == T());
#if TEST_STD_VER >= 11
constexpr T it2;
(void)it2;
#endif
}
#if TEST_STD_VER > 14
test_trivial<int>()();
test_trivial<char>()();
test_trivial<double>()();
test_trivial<S>()();
test_trivial<std::string>()();
#endif
}
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